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By forward do you mean rotate it front end in, rear end out? We've tried that. As it is there's no room for movement between the mech and the band-on adaptor, it's a 'perfect' snug fit.
There is currently room for it to go lower but only by 1mm or so. We have tried it set lower and encountered the same problem though.
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So you are saying: when set up to spec, i.e. everything aligned with the markers on the cage, the chain rubs on the cage when in small / big, because the cage cannot move further inboard?
In that case, I don't understand why spacing the crank further outboard won't help?
Are you running an axle with a lip, or not?
Out of interest, as that bike shares the same rear end as my Caad9, does it look like the FD is too far towards the back of the bike?
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Ideally not rotate at all but move it forward on the bracket (if possible?), towards the front of the bike.
The closer the mech is to the crank axle, the less the range of chain movement the mech has to deal with.
So lower is better too.
I think @Howard is on the same page...
does it look like the FD is too far towards the back of the bike?
Can you move the mech forward on the clamp, and lower?